Breakthrough of the Year, 2011

The year 2011 saw scientific research that stretched from the farthest reaches of the universe to the deepest mysteries of the cell. Following a yearly tradition, Science's editors and news staff have selected one scientific Breakthrough of the Year and nine runners-up -- and have also highlighted some areas to watch for 2012. [Access to articles may require membership or a subscription.]


HIV Treatment as Prevention

The antiretroviral drugs used to treat HIV-infected people also dramatically reduce HIV transmission rates, a finding that may influence the strategies used by health advocates and policymakers to battle the disease.

Related Policy Forum by J. D. Shelton: ARVs as HIV Prevention: A Tough Road to Wide Impact

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See Also


Science Breakthroughs

Some thoughts on the year in science, and what's ahead in 2012.
News Focus

The Year in News

Science's News Staff reflect on some of the important stories of 2011.
Science Careers

Breakthrough Behind the Scenes

Kimberly Powers's epidemiological research on HIV's early stages...
Watch a video presentation of this year's breakthrough of the year, and the runners up.


Special End-of-Year Show

Featuring the Breakthrough of the Year, 2011's top news stories in science, and areas to watch in 2012. Listen Now (mp3)

Also in this Special Issue:

Areas to Watch

Looking ahead at some exciting prospects for 2012.


A retrospective of last year's Areas to Watch.

A Disaster and a Warning—But of What?

When it struck on 11 March, the great Tohoku earthquake jolted seismologists...

Previous Years' Breakthroughs

Insights of the Decade Issue Cover

2010: Insights of the Decade

Science's news staff took a break from reporting to review some big ideas of the past 10 years and the technologies that made them possible.